Introduction

Welcome to our education blog explaining terms used in sewage treatment from A-Z. Part 6 is Raw Sewage to Sewage Treatment Plant/System.

In Part 6 of our A-Z series, we delve into terms from R to S, explaining concepts and components fundamental to sewage and wastewater treatment. This guide is particularly relevant for understanding package sewage treatment systems such as the BMS Blivet.

38. Raw Sewage:

• See Foul Sewage.

39. Rotating Biological Contactor (RBC):

• A sewage treatment method where settled sewage flows through a trough containing rotating media.

• Key Features:

  • Biological film (biomass) forms on the media surface.

  • Pollutants are oxidised through contact with sewage and air.

  • The BMS Aerotor is a next-generation RBC:

    • Actively aerates settled sewage, enhancing the aerobic process.

  • Also known as:

    • Rotary Biological Contactor.

    • Biodisc or Biodisk.

40. Sand Filter:

• A tertiary treatment system using media such as stone to polish final effluent.

• Purpose:

  • Reduces BOD and SS to 10 mg/l or better.

  • Example: BMS Package Final Effluent Polishing Filter.

41. Saran Filter:

• A tertiary treatment system integrated into the humus tank of a Blivet.

• Features:

  • Membrane with 783-micron pore size.

  • Focuses on reducing suspended solids (SS).

42. Secondary Settlement Tank:

• See Humus Tank.

43. Separate System:

• A sewerage system where foul water and surface water are conveyed in separate sewers.

• Opposite of a Combined System.

44. Septic Tank:

• A settlement tank where sludge undergoes anaerobic decomposition over time.

• Functions as:

  • A primary settlement tank with sludge storage.

45. Sewage:

• The waterborne waste of a community, premises, or process.

46. Sewage Treatment Plant/System:

• A system designed to treat raw sewage to a standard suitable for discharge.

• Typically includes:

  • Primary settlement.

  • Aerobic treatment.

  • Final settlement.

• Also known as:

  • Wastewater Treatment Plant/System.

  • Effluent Treatment Plant/System.

Additional Resources

For more detailed explanations of sewage treatment parameters, visit the BMS Education Blog/Customer Questions section, which includes topics like:

• BOD (Biochemical Oxygen Demand)

• SS (Suspended Solids)

• NH₄ (Ammonia)

• N (Total Nitrogen)

• COD (Chemical Oxygen Demand)

• P (Phosphorus)

Coming Up Next

The final article in our series will cover terms starting with S to W, including Sludge and Whole Life Cost.

Questions?

If you have any questions of would like information on package wastewater treatment products, feel free to contact us.

About BMS

BMS is a quality manufacturer of package products for wastewater and stormwater treatment:

• Established: 1986

• Global Reach: Exported to over 50 countries.

• Family Business: A third-generation company with deep expertise.

BMS Product Range

BMS provides a wide array of surface water and wastewater treatment products, including:

• Attenuation systems

• Interceptors

• Holding tanks (chemical-resistant options available)

• Hydrobrakes

• Rainwater harvesting tanks

• Vortex silt/oil/debris separators

• Fully fitted pumping stations

• Recyclone: A plug & play vehicle wash water recycling system

View the full product catalogue here

Additional Services by BMS

• Free Design Service: For sewage treatment, pump stations, and surface water management.

• Operation and Maintenance: Full services for existing installations, including repair, advice, and testing.

• Free CPD Presentations: Available for sewage treatment and surface water management, delivered at your location.

We would be delighted to discuss any requirements you might have, and we are available to meet you at your convenience.  Contact us today.

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